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Contributions to Economic Geology (short Papers and Preliminary Reports) 1916. Part II. -- Mineral Fuels. David White, G.H. Ashley, and M.R. Campbell Geologists in Charge. [U.S. Geological Survey Bulletin 641.].

United States. Congress. House

出版	1916
URL	http://books.google.com.hk/books?id=Vi07zQEACAAJ&hl=&source=gbs_api